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. 2016 Oct 20;7:13065. doi: 10.1038/ncomms13065

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Copyright © 2016, The Author(s)

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(a) Nyquist plots before cycling from 1 MHz to 100 mHz, (b) the second-cycle galvanostatic charge/discharge voltage profiles at 0.1 C, (c) cycle performances at 0.1 C, (d) rate capabilities and (f) the potential differences between the charge and discharge plateaus at various current densities of the TiO@C-HS/S, TiO₂@C-HS/S, TiO_2−x@C-NP/S, C-HS/S and TiO₂-NP/S electrodes. (e) Voltage profiles at various current densities from 0.1 to 2 C and (g) prolonged cycle life and Coulombic efficiency at 0.2 and 0.5 C of the TiO@C-HS/S electrode. (h) Areal capacities and (i) voltage profiles at various current densities from 0.335 (0.05 C) to 1.34 mA cm⁻² (0.2 C) of the TiO@C-HS/S electrode with high sulfur mass loading of 4.0 mg cm⁻².